A full-scale PHP 7.4+ sandbox class that utilizes PHP-Parser to prevent sandboxed code from running unsafe code.
It also utilizes FunctionParser to disassemble callables passed to the sandbox, so that PHP callables can also be run in sandboxes without first converting them into strings.
Manual: https://manual.phpsandbox.org
Online API Documentation: https://docs.phpsandbox.org
- Finegrained whitelisting and blacklisting, with sensible defaults configured.
- Includes dynamic demonstration system that allows for local testing of custom sandbox configurations
- Can redefine internal PHP and other functions to make them more secure for sandbox usage.
- Can redefine superglobals and magic constants to expose your own values to sandboxed code.
- Can overwrite the get_defined_* and get_declared_* functions to show only allowed functions, classes, etc. to the sandboxed code.
- Can selectively allow and disallow function creation, class declarations, constant definitions, keywords, and much more.
- Can prepend and append trusted code to setup and tear down the sandbox, and automatically whitelist the classes, functions, variables, etc. they define for the sandbox.
- Can retrieve the generated sandbox code for later usage.
- Can pass arguments directly to the sandboxed code through the execute method to reveal chosen outside variables to the sandbox.
- Can access the parsed, prepared and generated code ASTs for further analysis or for serialization.
- Can define custom validation functions for fine-grained control of every element of the sandbox.
- Can specify a custom error handler to intercept PHP errors and handle them with custom logic.
- Can specify a custom exception handler to intercept thrown exceptions and handle them with custom logic.
- Can specify a validation error handler to intercept thrown validation errors and handle them with custom logic.
- Can intercept callbacks and validate them against function whitelists and blacklists, even if they are called as strings
function test($string){
return 'Hello ' . $string;
}
$sandbox = new PHPSandbox\PHPSandbox;
$sandbox->whitelistFunc('test');
$result = $sandbox->execute(function(){
return test('world');
});
var_dump($result); //Hello worldfunction custom_func(){
echo 'I am valid!';
}
$sandbox = new PHPSandbox\PHPSandbox;
//this will mark any function valid that begins with "custom_"
$sandbox->setFuncValidator(function($function_name, PHPSandbox\PHPSandbox $sandbox){
return (substr($function_name, 0, 7) == 'custom_'); //return true if function is valid, false otherwise
});
$sandbox->execute(function(){
custom_func();
});
//echoes "I am valid!"$sandbox = new PHPSandbox\PHPSandbox;
//this will intercept parser validation errors and quietly exit, otherwise it will throw the validation error
$sandbox->setValidationErrorHandler(function(PHPSandbox\Error $error, PHPSandbox\PHPSandbox $sandbox){
if($error->getCode() == PHPSandbox\Error::PARSER_ERROR){ //PARSER_ERROR == 1
exit;
}
throw $error;
});
$sandbox->execute('<?php i am malformed PHP code; ?>');
//does nothing$sandbox = new PHPSandbox\PHPSandbox;
//this will disable function validation
$sandbox->setOption('validate_functions', false); // or $sandbox->validate_functions = false;
$sandbox->execute('<?php echo system("ping google.com"); ?>');
//Pinging google.com. . .- PHP 7.4+
- PHP-Parser
- FunctionParser (if you wish to use closures)
- PHP should be compiled with --enable-tokenizer option (it typically is)
To install using composer, simply add the following to your composer.json file in the root of your project:
{
"require": {
"corveda/php-sandbox": "3.*"
}
}Then run composer install --dry-run to check for any potential problems, and composer install to install.
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